Omar Khalid
Shrink plastic, also known as Shrinky Dinks, is a thin, cuttable material that shrinks to half its size when heated. It is used to make charms, jewellery, and other crafts. The plastic can be shrunk in a toaster oven, a regular oven, or a heat gun. When using an oven, the plastic is placed on a tray or baking sheet and heated at temperatures between 300 and 375 degrees Fahrenheit. The plastic initially curls up and then flattens out. This process only takes a few seconds.
| Characteristics | Values |
|---|---|
| Type of plastic | Shrink plastic, Shrinky Dinks |
| Plastic characteristics | Thin, easily cut with scissors |
| Plastic behaviour when heated | Shrinks to around half its size, becomes hard plastic |
| Oven type | Conventional, toaster, regular kitchen oven |
| Oven temperature | 300-375°Fahrenheit, 130°Fahrenheit |
| Oven preparation | Use tray, baking sheet, parchment paper, cardboard, aluminium foil |
| Plastic placement | Glossy side down, coloured side up |
| Plastic behaviour in oven | Curling is normal, will flatten out |
| Plastic behaviour when removed from oven | Very hot, can be flattened if bent |
| Plastic colouring | Use acrylic paint, watercolours, chalks, pencils, crayons |
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What You'll Learn
Using a toaster oven
Toaster ovens can be used to shrink plastic. This is a preferred method for some, as it means you don't have to use your regular kitchen oven, reducing the risk of releasing plastic or chemicals into your food. You can pick up a cheap second-hand toaster oven to use exclusively for crafts.
To use a toaster oven to shrink plastic, preheat it to somewhere between 300 and 375 degrees Fahrenheit. You can place your plastic directly on the tray, but using parchment paper or aluminium foil will protect the surface and allow you to slide the plastic off before it cools.
It's normal for the plastic to curl up and then flatten out. If the edges touch and stick together, remove the tray from the oven and gently pry the edges apart with pliers or forks, then put it back in the oven. Once the plastic has flattened out, it's done. Remove it from the oven and let it cool.
If you're doing this with children, it's a good idea to have something to remove the hot tray with, like pliers or an oven mitt, so you can quickly get the next piece in.
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Curling of the plastic
Shrink plastic is a thin material that can be cut easily with scissors. When heated, it shrinks to around half of its size. This process is usually done with a toaster oven, a regular oven, a heat gun, or an embossing heat tool. The plastic is placed in the oven on a tray at a temperature between 300 and 375 degrees Fahrenheit.
During the heating process, the plastic will curl up and then flatten back out. This is a normal part of the shrinking process and is caused by the plastic heating up in different spots at different times. If the edges of the plastic curl and touch, they may stick together. If this happens, the plastic should be removed from the oven, and the edges should be gently pried apart with pliers, forks, or tweezers before placing it back in the oven.
To minimize curling, a heavy weight vellum or piece of parchment paper can be placed on top of the plastic while it is shrinking. Additionally, a spatula can be used to flatten the plastic as it is removed from the oven while it is still hot.
It is important to be patient during the shrinking process and wait for the plastic to flatten out before removing it from the oven. Overall, the curling of the plastic during the shrinking process is a normal and expected occurrence that can be managed through careful monitoring and the use of appropriate tools.
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Pre-cutting the plastic
When it comes to pre-cutting the plastic, there are a few key things to keep in mind. Firstly, it's important to use the right type of plastic. Shrink plastic, also known as Shrinky Dinks, is a type of material that starts out thin and flexible, making it easy to cut with scissors before heating. It's important to cut out your desired shape before baking, as trying to cut the plastic after it has shrunk will be much more difficult.
You can also purchase sheets of shrink plastic or reuse #6 plastic found in items like salad takeout containers, plastic cups, disposable coffee cup lids, sushi packaging, and bento box lids. However, be cautious as some sushi containers are made of PLA, which melts at a lower temperature than polystyrene, the type of plastic commonly used for shrinking.
Before cutting, you can decorate your shrink plastic by drawing, stamping, or printing on it. If you're using a printer, remember to print at 50% size to ensure the colours don't turn out too dark after shrinking. You can also use paint pens, watercolour pencils, chalks, or heat-set inks like Staz-on. Just be sure to avoid dye inks as they won't dry properly. If you want to add some shine or protection, you can coat your design with something like diamond glaze.
If you're planning to turn your creation into a charm, don't forget to poke any necessary holes before baking. This will ensure that your charm is ready to assemble as soon as it's cooled down.
Once you've cut out your design and added any desired decorations, you're ready to start the shrinking process. Place your plastic pieces on a tray lined with cardboard or parchment paper and put them in the oven. Now, watch the magic happen as your plastic transforms!
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Pre-drawing on the plastic
When pre-drawing on the plastic, it is important to use the right kind of ink or colouring materials. Permanent markers, permanent stamp ink, and acrylic paint are all suitable for colouring shrink plastic. If you are using the inkjet kind of plastic, print your design at 50% so that the colours come out right after shrinking. If you are not using the inkjet kind, you can draw or trace your design with permanent markers or stamp it using heat set ink. You can also colour your design with watercolour pencils or chalks.
If you want to create a smooth finish, use a fine grit sandpaper to buff the plastic before adding your design. You can also purchase frosted plastic sheets or make your own roughened plastic sheets, which can hold more colouring sources, including coloured pencils. Keep in mind that your colours will darken as the plastic shrinks.
If you are making a name tag or something that includes text, write your words as big as possible, so they are still legible after shrinking. You can also cut out a piece of paper and glue it to the back of your plastic for added contrast. However, be aware that blue ink, even permanent ink, has a tendency to smudge, so you may want to add a protective coat of clear nail polish or super glue.
Finally, remember to punch any holes you may need before baking your plastic. You can drill a hole after shrinking, but it is more difficult and you risk getting too close to the edge.
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Toxic fumes
Heating plastic in the oven can release toxic fumes, which can be dangerous if inhaled. The toxicity of fumes from burnt plastic depends on the amount inhaled. It is recommended to ventilate the area by opening windows to allow fresh air to circulate and disperse the fumes.
In the case of melted plastic in an oven, it is important to avoid consuming any food that was cooked in the oven during that time, as the toxic fumes and plastic components can leach into the food. Even without melting, plastic can release chemicals that can contaminate food. Therefore, it is crucial to use only oven-safe materials, such as parchment paper, foil, or Silpat mats, when cooking or baking.
When working with shrink plastic, also known as Shrinky Dinks, it is important to follow the recommended temperatures and heating methods to avoid the release of toxic fumes. Shrink plastic is typically heated in a toaster oven, regular oven, or with an embossing heat tool to temperatures between 300 and 375 degrees Fahrenheit. It is important to use protective tools like pliers or oven mitts when handling the hot plastic and to be cautious of any toxic fumes that may be released during the heating process.
To minimize the risk of toxic fumes, it is recommended to cover the plastic with parchment paper or vellum during the baking process. This helps to reduce curling and sticking while also containing any fumes that may be released. Additionally, proper ventilation during the heating process is crucial to avoid inhaling toxic fumes.
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Frequently asked questions
Shrink plastic, sometimes known as Shrinky Dinks, is a type of material that starts out thin enough to cut easily with scissors. When heated, it shrinks down to around half its size and becomes a hard plastic.
Preheat your oven to a temperature between 300 and 375 degrees Fahrenheit. Place your shrink plastic on a baking sheet lined with parchment paper or aluminium foil. The glossy side should be facing down and the coloured side facing up. After 3-4 minutes, your plastic will be ready. If your plastic is slightly bent when it comes out of the oven, you can try to carefully flatten it out.
Some people have reported a toxic smell when shrinking plastic in their oven. There may also be a risk of plastic residue being left in the oven, which could then enter the food cooked in the oven.
